Xiaomi Mi 9 Wireless Charging is Faster Than Wired Fast Charging

April 30, 2019

With the improvement of phone charging technology, wireless fast charging has basically achieved the speed of mainstream wired fast charging. For example, the Xiaomi Mi 9 supports a 20W wireless flash charge, which is faster than the average 18W wired fast charge.

A few days ago, Lei Jun said on Weibo: ‘I said at the press conference that the Xiaomi Mi 9 wireless flashing is faster than ordinary phones, and there are still users who don’t believe it. So we also took a comparison video. In order not to hurt the feelings of our competitors, we took the Xiaomi Mi 8 as the second phone.’

The Xiaomi Mi 9 and the Xiaomi Mi 8 had no power when the test began. Both began charging at the same time, and when the Mi 9 reached 100% of power, the timer was stopped. The measurements show that the Xiaomi Mi 9 is fully charged to 100% in about one and a half hour. After 4 minutes, the Xiaomi Mi 8 (18W wired fast charge) fully charged as well.

It is reported that Xiaomi Mi 9’s 20W wireless flash charging is the real ‘end power’, which is the highest charging power that the receiver can output. In order to achieve a 20W end-to-end power, Xiaomi wireless charging board needs more power input. It supports 20V/1.35A, which ensures that the Xiaomi Mi 9 receives 20W maximum power during wireless charging.

The entire 20W wireless flash charging solution is independently designed by Xiaomi, and the wired fast charging technology is applied to the wireless charging system. It is accomplished with ultra-high conversion efficiency through the two-stage buck. At the same time, the 5-layer nanocrystalline magnetic isolation material and the multi-strand wound lifting coil transmission efficiency reduce heat loss.

Lei Jun said that the wireless charging technology originated very early, and this technology has not been promoted because of the problem of charging efficiency and cost. For the first time, Xiaomi did wireless charging, and it achieved 7.5W, and the compression cost will make the charging board of 300~500 yuan on the market achieve 99 yuan.